Royal Engineer officers in a Somme communication trench c.1916. Applying a transparent positive photo on a glass slide “Magic” lantern slides have their origins in the 17th century, the PowerPoint of the day (NAM. 1978-11-157-29-4) #WW1 #FWW #History #photography https://t.co/EWGDRPoLk7
— Stephen Chambers (@SteveJChambers)
Feb 23, 2023
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